JP3368484B2 - Bottle and molding method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an inner layer forming a deformable inner bag and a releasable laminated layer formed on the outer layer forming an outer shell of a fixed shape, without changing the outer shape of the inner solution. The present invention relates to a blow molding bottle made of synthetic resin, which allows the internal solution to be poured out without allowing outside air to enter the storage section.

[0002]

2. Description of the Related Art As a typical prior art of a blow molding bottle made of synthetic resin, an inner layer forming a deformable inner bag is releasably laminated inside an outer layer forming a regular outer shell. There is a technique disclosed in Japanese Patent Laid-Open No. 5-310265.

According to this conventional technique, a slit formed by adhering inner layers to each other and not adhering outer layers to each other is formed on a bottom parting line which is a mold cutting portion formed when a bottle is blow-molded. When the inner solution contained in the inner layer is poured out and used, and the inner bag formed by the inner layer is deformed in volume reduction, the outside air is allowed to enter between the outer layer and the inner layer through this slit, and The inner layer can be smoothly peeled off, and the volume reduction deformation of the inner layer due to the use of the inner solution by pouring is reasonably and favorably performed.

[0004]

However, in the above-mentioned prior art, since the slit, which is an entrance for outside air between the outer layer and the inner layer, is opened on the bottom surface of the bottle body, the bottle body is heated in a bathroom or the like. If you use it on the surface where is located, hot water will invade between the outer layer and the inner layer from the slit opened on the bottom of the bottle, making it easier for dirt and mildew to be generated, and dripping when the bottle is carried, There was a problem of soiling clothes and surroundings.

Further, since the slit is formed in the bottom portion forming the leg portion of the bottle body, the mechanical strength of the bottom portion as the leg portion of the bottle body is lowered, and the self-shape retaining ability of the bottom portion is lowered. As a result, the sitting of the bottle becomes unstable, especially when the internal solution is filled.
There is a problem in that handling must be careful so as not to give an impact to the bottom.

Further, since the slit is formed in the die cutting portion which is molded when the two split molds are clamped, the slit molding condition is not constant. Therefore, when the bottle as a product is handled, the slit is not formed. There is a problem that a large opening is formed and the appearance of the bottle as a product is deteriorated, and on the contrary, a large operation force may be required to form the slit by opening.

Therefore, the present invention was devised to solve the above-mentioned problems in the prior art, and prevents hot and cold water from entering from the entrance of outside air between the outer layer and the inner layer, and mechanically It is a technical subject to form a stable entrance of outside air, and a hygienic use form can be obtained, and a bottle with stable mechanical strength can be obtained.

[0008]

Means for Solving the Problems The structural means of the present invention for solving the above technical problems are a bottle molded by blow molding, an outer layer made of synthetic resin for forming a regular outer shell, and It is composed of an inner layer made of flexible synthetic resin that is releasably laminated on the outer layer and forms an inner bag, and a projecting piece is attached to the lower end of the cylindrical mouth part standing upright on the upper end of the body part. To project, and to form an exposed portion in which the inner layer is located at the tip of this projecting piece.

It is preferable that the outer layer and a part of the inner layer are adhered and fixed to each other with an adhesive band extending in the shape of a vertically elongated strip over substantially the entire height range while avoiding the projecting piece.

According to the method of the present invention for solving the above technical problems, an outer layer made of synthetic resin forming a regular outer shell and a flexible synthetic resin which is releasably laminated on the outer layer and forms an inner bag. Blow-molding a parison composed of an inner layer made of plastic into a bottle shape, and after this blow-molding, the tip of the projecting piece protruding from the lower end of the cylindrical mouth part standing upright on the upper end of the body The exposed part by cutting the part to the extent that the inner layer is located on the cut surface.
To form .

It is preferable that the projecting piece is formed by a blow pressure by blow molding and a vacuum pressure from the outside.
Further, it is effective to crush and form the projecting piece from a direction orthogonal to the projecting direction immediately after the blow molding is completed, before cutting the tip end of the projecting piece.

The thickness of the outer layer at the tip of the projecting piece is set from the dimensional conditions and the molding conditions, and the cutting point at the tip of the projecting piece is approximately the thickness value of the outer layer set from the tip edge of the projecting piece. It is good to set the positions at equal distances.

[0013]

[Function] The outer layer forming the regular outer shell and the inner layer forming the deformable inner bag for directly containing the inner solution are laminated in a peelable manner, and an exposed portion is provided between the outer layer and the inner layer. Since it is open to the outside, decompression occurs in the inner layer,
When the inner layer tries to deform in the direction of reducing its internal volume, the outside air intrudes from the exposed portion into the outer layer according to this deformation, whereby the separation between the outer layer and the inner layer is smoothly achieved,
Deformation of the inner layer is achieved reasonably and satisfactorily.

At this time, the outside air penetrates into the outer layer through the exposed portion, and only the inner layer is separated from the outer layer and is deformed in a direction to reduce the volume, so that the outer layer is not subjected to an external force for causing deformation and is deformed. The outer shape of the bottle is maintained without changing the shape of the bottle.

Since the exposed portion is provided at the mouth which is the upper end of the bottle, even if the bottle is placed on the surface with hot water,
This exposed portion is also covered with a cap because it is generally located above the surface where the hot and cold water is present and the entire mouth is covered with a cap. It prevents the invasion of hot and cold water and prevents the appearance of the bottle from deteriorating due to the exposed parts being visible.

Since the exposed portion is provided not at the bottom of the bottle but at the mouth, the mechanical strength of the bottom functioning as the leg of the bottle is not lowered, and therefore the bottom of the bottle is It is possible to maintain mechanical strength equivalent to that of the bottom of a normal synthetic resin blow molding bottle.

By adhering and fixing a part of the outer layer and the inner layer with an adhesive band over the entire height range, the inner volume decreasing deformation of the inner layer, that is, the crushing deformation of the inner layer, causes the part fixed by the adhesive band to be a fixed point. As, as it is performed according to the basic form of reducing the diameter while maintaining a constant height, in spite of the crush deformation of the inner layer, the state in which the content liquid can be well poured out is maintained until the end, Depending on the positional relationship of the adhesive band with respect to the parting line, the outer layers of the mold cutting portion at the bottom of the bottle are firmly bonded and fixed to enhance the mechanical strength of the bottom of the bottle.

The bottle blow molding die has a blind hole-shaped molding surface for molding a protruding piece at the lower end of its mouth molding surface. According to the blow molding of the bottle body, the projecting piece is formed integrally with the bottle body.

Therefore, the protruding piece is formed in a laminated structure in which the outer layer is located outside and the inner layer is located inside, but the exposed portion is formed by cutting and removing the outer layer portion at the tip end of the protruding piece. It is formed by locating the inner layer portion of the tip of the projecting piece on this cut surface .

As is apparent from the method of forming the exposed portion, the exposed portion is formed by cutting the outer layer portion of the tip of the protruding piece without breaking the layer structure of the inner layer. As the structure of, the structure in which the inner layer is located inside the outer layer in a pure state without having a cavity communicating with the bottle body inside the inner layer, the exposed portion can be safely formed without breaking the inner layer. Most preferred for

However, it is necessary to form only the blow molding operation to form the protruding piece having a structure in which the inner layer is located inside the outer layer without forming a cavity inside the inner layer by the blow molding operation. In some cases, the physical properties of the synthetic resin material are severely restricted, and it may be difficult to carry out the method reliably and stably.

Therefore, when molding the projection piece, a blow pressure and a vacuum pressure are simultaneously applied to the parison portion formed on the projection piece, and the cavity is formed by suctioning the parison resin material with the vacuum action. Without molding the projection piece at once, or blow molding the parison part that is molded on the projection piece, immediately crush the blow molded projection piece from the direction orthogonal to the projection direction and mold it inside. The cavities that may be inside are eliminated and the inner layer inside the protrusion is made solid.

Further, when it is not desired to severely limit the size of the projecting piece, since the projecting piece is formed by the mouth portion having a small amount of stretching deformation, the outer layer and the outer layer at the tip portion of the projecting piece are formed. Since the thickness of the inner layer can be set relatively accurately and the thickness of both the outer layer and the inner layer is large, even if a cavity is formed inside the inner layer, it can be predicted from the tip edge of the molded protrusion. By cutting at a position substantially equal to the set thickness of the outer layer, even if a part of the inner layer is cut, the exposed portion can be formed without breaking the layer structure of the inner layer.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. The bottle body 1 is blow-molded from a parison obtained by extruding an outer layer 2 made of a high-density polyethylene resin, an inner layer 3 made of nylon, and an adhesive band 9 made of an adhesive resin into a laminated cylindrical shape by coextrusion molding means. , Cylindrical mouth 5
A screw thread is formed on the outer peripheral surface of the cap for screwing and assembling the pump cap 8.

The projecting piece 5 is provided so as to project on the outer peripheral surface of the lower end portion of the mouth portion 4 which is a lower part of the screw, and when the tip portion is cut to form the exposed portion 6, its projecting height is increased. However, the threaded assembly of the pump cap 8 with respect to the mouth 4 is not disturbed.

2 to 5 show the structure of the bottle body 1 immediately before the exposed portion 6 is cut and formed, that is, immediately after the blow molding. The projecting piece 5 is located on the parting line. A pair of adhesive bands 9 (see FIG. 5) are arranged at positions deviated from the piece 5 by a central angle of 90 ° so as to face each other over the entire height range of the bottle body 1.

By providing the adhesive band 9, the internal volume reduction deformation of the inner layer 3 can be caused in a substantially constant form, and the outer layers 2 in the mold cutting portion at the bottom of the bottle body 1 can be solidified. Since they are fixed by adhesion, the mechanical strength of the bottom of the bottle 1 is increased.

FIGS. 6 to 10 show a method of molding the exposed portion 6 when the protruding piece 5 is formed by molding the inner layer 3 on the inner side in a solid state. FIGS. 6 and 7 show the protruding piece 5. By setting the diameter of the protrusion to about 5 mm, the protruding piece 5 is molded only by the blow pressure or by the combined use of the blow pressure and the vacuum pressure. The exposed portion 6 is formed by cutting at an appropriate location that has a protruding height that does not interfere with the assembly of the mouth portion 4 into the mouth portion 4.

The embodiment shown in FIG. 6 and FIG.
Although the dimensional conditions and molding conditions for forming the exposed portion 6 are severely restricted, the cutting and forming of the exposed portion 6 may be performed simply by considering the assembling of the cap 8 with the pump to the mouth portion 4. The easiest and safest way to achieve.

FIGS. 8 to 10 show a method of forming the protrusion 5 in which the cavity 7 formed by blow molding is eliminated so that the inner layer 3 on the inner side is in a pure state. The state in which the cavity 7 is formed is shown. Immediately after the blow molding operation, the portion of the protruding piece 5 blow-molded by is crushed from a direction orthogonal to the protruding direction of the protruding piece 5 so that the cavity 7 disappears and the inner layer 3 still in a molten state is removed. By integrally welding, the inner layer 3 portion located inside the projecting piece 5 is made in a pure state.

In the embodiment shown in FIGS. 8 to 10, since it is necessary to crush and form the protruding piece 5 immediately after blow molding, the forming operation of the protruding piece 5 is troublesome, but the cavity 7 is formed. Since the protruding piece 5 can be blow-molded under favorable conditions, the dimensional conditions for forming the protruding piece 5 and restrictions on the forming conditions are alleviated as compared with the embodiment shown in FIGS. 6 and 7.

As shown in FIG. 8, even when the protruding piece 5 is blow-molded with the cavity 7 formed, the layer thickness of the outer layer 2 at the tip of the protruding piece 5 is accurately predicted and set. If it is possible, the exposed portion 6 can be molded by cutting and removing only the outer layer 2 portion of the tip portion of the protruding piece 5 blow-molded with the cavity 7 formed. It is possible to blow-mold the projecting piece 5 with almost no restrictions on the conditions, but since the size of the tip of the projecting piece 5 to be cut and removed is specified, the projecting height of the projecting piece 5 can be reduced in advance. In addition, the layer thickness of the outer layer 2 in the projecting piece 5 can be accurately predicted and set, and the layer thickness of the inner layer 3 in the projecting piece 5 becomes sufficiently large.
It is necessary to minimize the amount of blow deformation from the parison to the protrusion 5.

In the illustrated embodiment, the shape of the projecting piece 5 is a cylinder (round bar) shape, but it may be another shape (for example, a square pole shape), and the number thereof is not limited to one. If necessary, a plurality can be provided.

[0034]

Since the present invention has the above-mentioned structure, it has the following effects. Since the exposed portion for allowing the outside air to enter between the outer layer and the inner layer is provided at the lower end portion of the mouth portion where the cap is assembled, the exposed portion is covered with the cap when the bottle is in use. Water does not enter between the outer layer and the inner layer from this exposed part, so there is no stain or mold caused by the water that entered between the outer layer and the inner layer, and stains caused by dripping when the bottle is carried. It is possible to obtain a sanitary and safe form of use for bottles without the occurrence of

Since the exposed portion is not formed by the die cutting portion at the bottom, but is formed at the tip of the projecting piece protruding from the mouth by the breaking process, the bottom of the bottle is the same as a normal blow molding bottle. The strength can be maintained, so that the sitting of the bottle body does not deteriorate, and special handling is not required, and a good and stable usage pattern can be obtained.

By providing the exposed portion at the mouth, the exposed portion and the projecting piece that forms the exposed portion can be covered with the cap, so that the external shape of the bottle is not impaired, and the product can be used as a commercial product. A good appearance of the bottle can be maintained.

Since the exposed portion is formed by cutting the tip portion of the projecting piece integrally molded with the bottle, the exposed portion can be formed in a preferable and constant shape in advance, and the exposed portion can be formed. Therefore, it is possible to obtain a simple and preferable handling without requiring the user to perform a troublesome forming operation.

Since the protruding piece forming the exposed portion is integrally formed with the bottle body by the blow pressure which is the blow molding force of the bottle body,
The molding process is simple, and even existing blow molds can be easily implemented with a small amount of processing, so they can be performed easily and smoothly, and exhibit excellent productivity. be able to.

[Brief description of drawings]

FIG. 1 is an overall side view showing an embodiment of a bottle according to the present invention in a state where a cap with a pump, which is vertically cut in the right half, is assembled.

FIG. 2 is an overall side view in which a right half is longitudinally cut, showing a bottle before forming an exposed portion in the embodiment shown in FIG.

3 is an overall rear view of the embodiment shown in FIG.

4 is an overall plan view of the embodiment shown in FIG.

5 is a plan cross-sectional view of the mouth of the projecting piece of the embodiment shown in FIG.

FIG. 6 is an enlarged vertical sectional view of an essential part showing a structural example of a protrusion in the present invention.

7 is an enlarged sectional view of an essential part showing a state where an exposed part is molded in the embodiment shown in FIG.

FIG. 8 is an enlarged cross-sectional view of an essential part showing another example of the structure of the projecting piece in the present invention.

9 is an enlarged cross-sectional view of an essential part showing a molding process for the protrusion shown in FIG.

10 is an enlarged sectional view of an essential part showing the structure of the protruding piece shown in FIG. 8 after a molding process.

[Explanation of symbols]

1; Bottle 2; outer layer 3; Inner layer 4; Mouth 5; Projection piece 6; Exposed part 7; Cavity 8 ； Cap with pump 9; Adhesive band

Front page continued (58) Fields surveyed (Int.Cl. ⁷ , DB name) B65D 1/00 B65D 77/06 B65D 25/16

Claims (6)

(57) [Claims] 1. An outer layer (2) made of synthetic resin that forms a fixed outer shell by blow molding, and a flexible synthetic resin that is releasably laminated on the outer layer (2) to form an inner bag. A cylindrical mouth (4) that is composed of an inner layer (3) and is erected continuously on the upper end of the trunk.
Attach the inner layer (3) to the tip of the protruding piece (5) protruding from the lower end of the
Bottle body made by forming the exposed portion is positioned (6). 2. A part of the outer layer (2) and a part of the inner layer (3) are provided with projecting pieces (5).
The bottle according to claim 1, wherein the bottle is adhered and fixed by an adhesive strip (9) extending in the shape of a vertically elongated strip over substantially the entire height range. 3. An outer layer made of a synthetic resin forming a regular outer shell.
After blow molding a parison consisting of (2) and the inner layer (3) made of flexible synthetic resin that is releasably laminated on the outer layer (2) and forms the inner bag, stand up at the upper end of the body. The exposed end (6 ) is cut by cutting the tip of the protruding piece (5) protruding from the lower end of the continuous cylindrical mouth (4) to such an extent that the inner layer (3) is located on the cut surface. ) Molding method for bottles. 4. The bottle molding method according to claim 3, wherein the projecting piece (5) is projectively molded by blow pressure by blow molding and vacuum pressure from the outside. 5. Prior to cutting the tip of the protrusion (5),
The bottle molding method according to claim 3 or 4, wherein immediately after the blow molding is achieved, the projecting piece (5) is crushed and molded in a direction orthogonal to the projecting direction. 6. The thickness of the outer layer (2) at the tip of the protrusion (5) is set based on the dimensional conditions and the molding conditions, and the cutting point of the tip of the protrusion (5) is set to the protrusion (5). ) From the leading edge to the outer layer (2)
The method for molding a bottle according to claim 3 or 4, wherein the position is set at a distance substantially equal to the set wall thickness value.